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[技术互助] A Tip on changing 3 phase AC motor rotation

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发表于 2010-4-14 11:27 | 显示全部楼层 |阅读模式
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本帖最后由 td456 于 2010-4-14 12:28 编辑
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  K6 R1 f! J( z/ E* `- g; ?We all know that if you want to change the rotation of a three  phase AC motor.1 s8 |* b- T5 ?3 ^. S, l( N
Just swap any of the two phase leads.) y2 |3 [) z) a
But for VFD application you need to do the swap after the inverter.
9 ]( P6 ]1 ]$ VIf you swap the leads before the inverter, it will not work.
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发表于 2010-4-14 18:18 | 显示全部楼层
go go go
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发表于 2010-4-19 14:38 | 显示全部楼层
Yes, Good point., Y3 w5 q. A4 t- q; k6 B

* t  E+ l- |0 A9 a3 bAs the principal of the VFD works, bascially from AC to DC, then DC to AC. & R) Q2 Y4 J. q7 x, D1 }

! ^6 @' w8 z2 B5 x. X- U6 rThe phase rotation of the output of the VFD connecting to the motor is based on the sequence "open" or "close" controlled by the inverter pre-set inside; any changes to the phase rotation of the feeder will not affect the DC rotation, as DC is NO phase at all.' q' s" B% M5 ^1 P& }* ?

, |2 H9 Q0 ~# z( T! G$ UThe only thing you can change the rotation of the motor is the output side of the VFD, NOT the input of the VFD.
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发表于 2010-7-4 00:19 | 显示全部楼层
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